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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a856684dbbbb137664a8db4de2463bebdbb95fe23becdd64e07dd29d2cc89759' 
  AND token = '3bjlBf9eKWabFa4ubeK6EnFq6JWjwXS7mxKI9nF9gxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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