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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0baf482510281482e2e41bac0d5395d2d8ad87bd936f5903b33bb1c024fe6d2d' 
  AND token = 'iMDZp7BRwCdvfMrfleQL7PXQLeqF/8n+SZ513ESqKfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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