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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24853e3c524ea781d148730694c60fa3c4fa3849d66c3e280f1ac839cf45e7a3' 
  AND token = 'iUefMsRdC3VUpITkN73kYibzc0FZfZ2siVekEdTbuoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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