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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9613681ebd0b6a72aa06faed468279306e490c11d7ba13e7d5988d78a1e73031' 
  AND token = 'U/VMS191REpELe2kv2JFBrh+Mh3VWPOBJTB598ssnqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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