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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac941b6d2450bd92c83f818f4495d99c86d758b4cd98f2f1bd3458da6610c417' 
  AND token = 'cz8iv0gRgKmexGXyl8Rg8llXgrZh8+Y9ru3mQG5qg8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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