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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f933c7c27aaa44751adf12ebecd5fba1682e64f159cd9134c323630865e93d' 
  AND token = 'wLJVmMQRQzet6X1HhBtc7y2pLUuHStpvnb5axUWBoaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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