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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f0cb44569a59ceee28facc35780ac23b2954cd42a148124d12c5bbc7e860b2' 
  AND token = 'I9Vx+lAESYT6Xkb4iRdi+y6jcL8KlD5LOo8+ZPVfwPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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