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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30719e5169ca808dbcd8b61a7ac427d98fff3c883cd81caeb4ef0ebe51f2632' 
  AND token = 'fs7t2F9xJoLEwU1ihkUImh/pQzx/moZPHG5xUem1ih4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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