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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36761b1563db2fc90a8b694af0669fffb40b1b671537f232095f59bc11abb0e' 
  AND token = 'V9yQh3/Ku6vskDMIErabXWOnu9O81pED5kq2u9BtZRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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