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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b8e1edec2c07d81e02d46efe5f8fe452ee1dcd661fe030dbd7788f690c9ba6' 
  AND token = '5KfBX0JmOxEQpI4UZo+h1uDB8sQjM31ASvR4XM+TBBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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