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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cec017951cf42e5dc957b98c7feef071a64762979836a03cd775dc2330297dc' 
  AND token = '6RgvCdFzsKhBCR4gYSQa57HgfLfWZOnabEI3JGizw1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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