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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fbb92f00e6895ede915e2636968bf2b98a30094117dd9f879f0dbf90524af7b' 
  AND token = '7mS2SkfMOkCkmZ87mgvwVE3wqSTRnS0HlDu7ZABmAN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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