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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a0a9ed28f729b112283ed99d0a01053301b003a03ab9eea49c3edfb6ff4a41' 
  AND token = 'UEC4tJian0+ONbtdTiQVzFov1HabtA81czJSlK/XcTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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