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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634f114b39470ca21e10940896815674825bbcfec10de830f1daa0c58e42be34' 
  AND token = '4P8K+5uE6hKoXDULhb49b7zE3O0cJMvPVXz/jhq9JmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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