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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a015145e76f07625ac004f77c50a1889cfd6a9f331955c132b73dae476b42427' 
  AND token = 'A90hOhiRIX3QeNBlOcXr0Ie/IaDbsyT57URWvYWq4QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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