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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a273bfc535d0f02de8a3ce01609cea98eb099f8a477e48cf66e6ba8a40e87c' 
  AND token = 'xtE+E3kH1pZkgi5EVQ7/XU2UCl59Vn09FJemVIw25ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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