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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df44c2b75bbbd17ef8f2605fcd9a9010a7db62ec14b197f9121707a4be81df37' 
  AND token = 'dW75Le6xCMs7/xurRlirucVpj/bUH76rAP6PEp2db8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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