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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cab8bba977f1a07fdfa900de78dc35a352cc5a494c6ac962eb1fc46dd5bc008' 
  AND token = 'kLKdWHuH92+wfUgoAYJK8pbDsq914AJfwXmFoYUuT24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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