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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3942b1a504a7d7c938577966f7f919d7c429ea88c8d15814c6f359cb994f352' 
  AND token = 'kex+TZiKNM9xXRYe47TZ49btbo9Lskud1hZ8P7jlGuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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