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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2e1711d2e8bc17ee3f468e60e8f767468c7ebc1184e5ca5dd652ad47fd03cc' 
  AND token = 'iYZRcG4atZH1VK/D2fZAdVmZ6CrsbMAp1bNwxJotlOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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