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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a463e6bca02539a948c406fb3dad062977703565a4fdf4469e681d4f62b5a3' 
  AND token = '/2IyGvh3GNyfzdwu8NdMzj2jpzlQd7qMbuV3z7yVQqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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