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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a2fa25989f92965ec56bf913bbd54d46451e5348f2efad4bb72b69a8b69dad' 
  AND token = 'Mgp16OjSbMPLkoLVeUXYfFb1rtjK+Y2MrSlJoNhofXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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