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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c3359e4b6610e5f70a01f114e9516a9581d616df9d9727e7c9ca6cd244eef2' 
  AND token = 'jIo/XxKmqh+uHN+SMGN3sSLSf36hdJqT3jMj3znJgtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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