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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83ff4d3101ca7304d65e88fd98d0a0fec7c2c679d60bdc824dd74c6e613dcb4' 
  AND token = 'Bne/cq4IEehiRmS25rLlAacDpMY3nUfTbjlkiKD3Z14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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