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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76deb260608b06d183b0094bf985bf19b1afbb079ff1b32e74cc8a31417b2ecd' 
  AND token = 'O6H3uL5tQRxSaOrqTFThRqpD7wMrkO3yK8VWRLeuFdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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