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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb937d5ca71a81f776cb51c811d7cd96ebbc15b238b11b74e109b5ddf9659927' 
  AND token = 'jmy2dm+gcXhRTyu8CgVAmC9MomGiVZ/ToqrFuz7V1wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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