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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a00dd92f3e63a7e8254c61bc11749ea9619f0d024e212b4bf15733b5a14ec57' 
  AND token = 'a56O+SdnqZbA68WEah/Jg5M3qTK+9cdcsntbnuQyUQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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