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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6970debc08adc82b038c2936d03826906af40692aa44f95e3c8ac86d81255c2e' 
  AND token = 'U3sbGR23fFT+DoMQus3oubaWI3CHgQFGyVfM4clID20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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