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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c63a8f185cfe61aaf35608e780010119e020f4a2ef36d26afee4bf20c8f73e0' 
  AND token = 'Sux4vWB8+pwMvnZOxi2RTR/WAw9ar0OAEwD8hfzwLx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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