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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd69dfbbe263c91707b94fdbcd6e87601cce5c744cecb5b35ceee7df049cd24' 
  AND token = '/u1BP4eVyNUUGySQF29sj/ot6u5hJ41tnp3LYlXIlG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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