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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68845af9e4c0723618ce72c12559ea0973072065e81b492170f7b972f6fe0774' 
  AND token = '2ENREmG4T+dBCmKDEksmZs7jYVc5zDllVuwMianDj+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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