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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85d764f95369c824effbe1fca7418f98a14c190620c67839be36faf9ac772cb' 
  AND token = 'FSBS4k8dfr0RL8jHdlfqv6hxmsIlbqQfy3rlfqxmEGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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