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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5397cd9320134b5fac52ddb5295552eb4617a5afa1638102dce44647818cdb8' 
  AND token = 'JcMQslnaeh+Nmb2o901sWy/kNtAP6aNkoPRUf6SN5X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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