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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8bff5b4a7bbd04126e646ed9c1b6b0273a6533dcbb8b28c56b528ed912263d0' 
  AND token = 'whSJ2sQiUS5mrIZXUo+S9QZWnBCM0YTBS0Tts103HEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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