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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88503ed9ccedfc43ba32b259022fb54d16aa83139eda0160f16ef29bf74d8c17' 
  AND token = '0d0dSOKKi9K8KyBAu+C22Ly8fqcAM+MyrZXCW8XHTQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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