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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d8db7840053e28ff5c32b5f759d46893d5f8f27fb23dad5e459b709a150717' 
  AND token = 'hlEsQWBOzIYhwb1dQckPfgOYSwPs7uVvF3IsTuZ98yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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