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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10a881253eda712871619e4a7883ba91554fd0e95c1e26ec991b3721c6f66276' 
  AND token = 'nN0kgOuOQ6jw4k2je63glaQfJZRsZ90e3gNyoDioRJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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