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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deec67301ac7fbccc2d6e5acaa68539d7a48be7ef145f4bdbd4fc6bf00ae7f59' 
  AND token = 't6Tjzxok6RzcZrZ08Nsb4VrRiNFvxePijErw7EV07ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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