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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6407b0279087b53b190787600abc4d8b8cfaa5589847ca74616172502ae2b84' 
  AND token = 'EdKtgQZ/jJET5T8gCMDZljmggL7AuByDfmCO5cAALR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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