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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df6c5edae4b1b60d6d2da3028ba1abfb4b0c5a195cb7541dd18265eb0b22ca6' 
  AND token = 'bYlZYaLqhiSWA2uxB+tF9bmrh6ZR2FyNLP970HxFAtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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