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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771347bab7860573dc654157e2705dc98245f19e4d88b7d17fd722b158c25cb6' 
  AND token = 'kkRy7q74sXHJyBOBmLuwxYyMmjP5Tpp9Sn76HBZ8bYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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