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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f606cf49cf83164ad378ede791875bdf69adb1687576861918045a7740c84e4c' 
  AND token = 'pY2FoueX1cIsNOAxGEhy0eoS1C3S8Gb8wJ5J48EbVgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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