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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32a983e78315f2cbc6d8618bbfc047c33257c6ab2ed8cd8bc56e3258b4dda7c' 
  AND token = 'smkLtfQXPK+luLRj2xnUpacFVKE25EimN+FbrIwQTzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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