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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f219716f6b64900a5b4b7db5e5c44df520974cb04eace1428201dd448ae66932' 
  AND token = 'tQoi64fGCzSGN7lrLDg0PaaVpZ2hjXdhMQd1iHJg4XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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