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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfaf55bec5a48cfeb04860e7ccd53e0366c07b492a1f14c2e0c5efb9483fe18f' 
  AND token = 'UON6yb8siWWALwOE5FOW/eRDXGfngSZwOlTzKqWVLoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}