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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e82d06d2d29d0b607338c8f7eeee8d3c2aae19a87952dd50a1e7d12124c856' 
  AND token = 'XjQP43/7e8gVVTwRMcZ5zCZZxfLFhdFbIYEwXf8lqJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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