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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbaab2abd1c7972cfc3e1bdff1aefc35b8bfe3afb5c63eb4d7984f0ddc59a535' 
  AND token = 'dj86ce2trDW9PWg2bk1/hDZ33MRkgEF0evKrW6Hc784=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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