SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2253bb6a45a337926f65032b287b444c5ece2b3d72ed80f90163b11f3a7536ef' 
  AND token = 'VTTWh9YeyX/+eWFqTaJBzozH0PceSB39Uur8OZl/Q1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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