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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c725551b55891bb297e87c6fb27f4e92db7c671bbb50f0b2eeb5bdbba8e02f93' 
  AND token = '6Af5I9aze9FsnffNdXQiOUhK0jzi0qx6wG+x/BKn51c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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