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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d1617d2c12bf43cd42827bd5792c7b632309af32eb5415d59ece422b08f827' 
  AND token = 'QDp+Sydc/rnQQ1S4Mcxsyl0F8jajkYsmCmXkqgh79Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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