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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11dfaf70c5ba323b1a38c2e65589cd9c36b71e96586c388a3c594d4dfd396ff5' 
  AND token = 'm4EYT0chR2eB7uHw/StYL9vJkMXNE5bAYMMdUsG5vcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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