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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a530b738944c7d75d587e01bae15f58f6a9fcbc8a8f6ac23a736a3404f956421' 
  AND token = '1ll1d/PTHYpM/9xT07TRor/RgPzsM+ChhkkeXEnQCJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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