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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0728b5da485e28c9b82e60f4383d5e151353a710f63e60cf4ae3ef05bd68cf2d' 
  AND token = 'rDANKV7PmDOKsqo22Z5htMuLJK6Xltl58mKh8TWYmlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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