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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd0bc62e352c75eed371b3242fa0da2212f564ea0c40e3fc16f6b5de64f07f4' 
  AND token = 'sukP7ZzEletQUtyEQbca7H5swE8NHteoppy/CDGx2Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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