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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb11003d313706aca87ed3cd3848f8291f35cf789a5b978bf353618b4c2858b' 
  AND token = 'pEi16iMPHu6AqFvUqBwlWkQwVi67WBa2PHCj1a8sZzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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