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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa1123c9c5a3974882c6eb7dbc8e58815400ac31a0f0fe6712eee3c718c825d' 
  AND token = 'Rg9wjesgeUj9jkuQd3X56uqrL2vZg7UT6R/CUmeDP8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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