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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf33b816ba0334fbb364c07f87ed4a30a66f86b73bfe1bc756031a4d8b019909' 
  AND token = '/z7Wsmx2yB/5eQTSED/YVyMSzSSZRiaXf45SYHBRjRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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