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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6825c6f1a900029656d72dc1420054d49f0886440ea7dcb3b7504a62b8286a72' 
  AND token = 'HkYw0+/9wuv8jO0TejvmaUol0vRsYyA6Tw5JG6q5pUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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