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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b49612c4cead015553353ae71ae3e12ad9a4bfa926af05a43bfffd6a796ade' 
  AND token = 'YQHxqoCu5+KtG9+h6BzWGBQ+c31yR8UoYiGVOajdCow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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