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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae7a409f90d93d271c6a3980711a585aecfc78e876e9184ae8713b786b98eee' 
  AND token = 'bhvdQHbuxIVESLInz/pe+e9m/59ZVzZFKWjLJ7AZQ6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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