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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '340f24bad17a926973f657e4e664a4049eb7f6b74ef4c8a6580b7ad973fc0138' 
  AND token = 'kGb0S3KR3JucfHzu7LP9H/GvGt+fw5CiNt9U7BVNWjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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