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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb5954366685d3360f19207649a4c990f98d7fe6a4a7fde9e8d6c0d2c6b1ea4' 
  AND token = 'a39yHT79hKN7vFV4PLttbnWnDT4GvTc6zceOpxMNcfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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