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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '997d5821295c51f597b983039c4504c473d674a4bcd5931f7381f5c92b79d423' 
  AND token = 'XXVhj+/S1Bs2x8ASkdqOrTu2x2RmkSQo+tQVm59EKnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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