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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46cf5820f0bd476d430e482ff804287dde713f307a6f48b38892d7fdc51169db' 
  AND token = '4cRbpdAqtSg/YSw8nSI+XO3gsz7dJF5Bi5VFQEgMnDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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