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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d0ef05c62d9dbaee35e364d5783cf9c1f8bebd3118ec9cf8fd9dbe6f0faf13f' 
  AND token = '1JPzmSbLySLeFn3ERs6gsV8wj65coHxp+Bg7sqI3UkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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