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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802a170244902b5b747e07ada0808fe44f7d68c01d00d2e8c693b94327f83770' 
  AND token = 'EktlE3ztFctWuKY54ajzq71AiSeBq3bMoqFD9AOB9/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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